21.   Since these receptors are present on normal breast cells, their numbers on cancer cells are an indicator of the degree of malignancy.

22.   Soy, when added to the estrogen that is normally present in young women, may make breast cells mature at a much faster rate and protect against cancer.

23.   Some even believe it may retard the growth of breast cancer cells, and, as an anti-oxidant, may help retard aging.

24.   Sulforaphane, found in broccoli and cauliflower, may inhibit breast cancer cells.

25.   Tamoxifen, on the other hand, blocks estrogen from binding to receptors in breast cells.

26.   The drug acts by protecting breast cells from the growth-stimulating effects of the hormone estrogen.

27.   The first full-scale trials of an experimental drug that attacks a genetic defect in breast cancer cells show significant promise for women with advanced cancer, scientists reported Sunday.

28.   The hormonal dysfunction that can cause a miscarriage may also interfere with the normal development of breast cells, she said.

29.   The gene seems to play a pivotal role in suppressing malignant changes, and when it is inactivated the breast cells become much more prone to cancer.

30.   The researchers injected a type of human breast cancer cells known to produce high levels of PTHrP into mice.